I know this looks like an ACE Double, but it’s a clever imitation. Armchair Fiction is reprinting SF from the 1950s and 1960s in a faux-ACE Double format. Sometimes, they use the same covers that graced the front of those classic ACE Doubles, sometimes not. So far, Armchair Fiction has published 50 books in this back-to back double novel trade paperback format. They also offer a line of SF singles. If you’d like to check out this wonderful publishing endeavor, just click here.